Finding the Fourth Proportional to 21,462.06, 29,612.82 and 12,965.58

Step by Step Solution

1. Step 1: Write the proportion equation
   21,462.06 : 29,612.82 = 12,965.58 : x
2. Step 2: Convert to fraction form
   21,462.06/29,612.82 = 12,965.58/x
3. Step 3: Cross multiply
   21,462.06x = 29,612.82 × 12,965.58
4. Step 4: Simplify right side
   21,462.06x = 383,947,386.74
5. Step 5: Solve for x
   x = 383,947,386.74/21,462.06
6. Step 6: Final answer
   x = 17,889.59